CVE-2026-63771

medium

Description

Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.

References

https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h

https://github.com/vrana/adminer/issues/1298

https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header

https://github.com/vrana/adminer/releases#release-v5.4.3

Details

Source: Mitre, NVD

Published: 2026-07-20

Updated: 2026-07-23

Risk Information

CVSS v2

Base Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N

Severity: High

CVSS v3

Base Score: 7.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Severity: High

CVSS v4

Base Score: 6

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00243